The Bambu Lab A2L and Elegoo Neptune 4 Pro are both prosumer-tier printers, but the A2L costs 1.8× as much — so the question is what the extra money buys. Both are open-frame bed-slinger printers with a 500 mm/s rated top speed and automatic calibration. The A2L costs $209 more and gets you 156% more build volume and 4-slot multicolor; the Neptune 4 Pro answers with extra engineering materials (ASA).
First-generation product — recently released, still early days
Best for: Makers who want the largest possible open-frame build volume on a budget — large cosplay, terrain, and functional parts — with optional multicolor via AMS Lite.
Full details →Overdue for a refresh — no successor announced yet. Prices should be at their lowest
Best for: Budget-conscious makers who want a capable bed-slinger with Klipper firmware for customization — without Bambu's closed ecosystem or Prusa's premium pricing.
Full details →| Bambu Lab A2L | Elegoo Neptune 4 Pro | |
|---|---|---|
| Pricing | ||
| Starting Price | $469 | ★ $260 |
| Print Specs | ||
| Tier | Prosumer | Prosumer |
| Motion | BedSlinger | BedSlinger |
| Build Volume | ★ 330 × 320 × 325 mm | 225 × 225 × 265 mm |
| Max Speed | 500 mm/s | 500 mm/s |
| Multicolor | ★ ✅ 4 slots | ❌ No |
| Enclosure | ❌ | ❌ |
| Auto Calibration | ✅ | ✅ |
| Open Source | ❌ | ❌ |
| Upgrade Kit | — | — |
| Buy Timing | ||
| Released | Jun 1, 2026 | Jul 15, 2023 |
| Cycle length | — | ~450 days |
| Cycle advice | Buy | Wait |
| Deals advice | Buy | Buy |
| Next model | — | — |
The A2L was released on Jun 1, 2026, 164 days ago. It is a first-generation product, so there is no earlier cycle to predict its successor from.
The Neptune 4 Pro was released on Jul 15, 2023, 1,216 days ago. Its previous release cycle ran about 450 days; it is now 766 days past that point and no successor has been announced.
On timing alone, the A2L is the safer buy right now — it launched only 164 days ago, while the Neptune 4 Pro is 766 days past its ~450-day cycle with no successor announced.
Cycle and deal status as of November 12, 2026. See the launch calendar →
The Neptune 4 Pro lists at $260 and the A2L at $469 — $209 apart, so the A2L costs 80% more.
Per litre of build volume, that works out to $14 for the A2L versus $19 for the Neptune 4 Pro — so the pricier A2L actually gives you more build space per dollar.
With both in sale windows until Dec 5, 2026, this is a good moment to buy either — compare the live sale prices before you decide.
Our pick for most buyers is the A2L, for 156% more build volume and 4-slot multicolor, plus a higher editor score (9.0 vs 7.7) and better buy-now timing. Go for the Neptune 4 Pro instead if you want to spend less — it is $209 cheaper ($260 vs $469).
How we judge timing and deals: read our methodology →
Bambu's largest bed-slinger build volume, big enough to print full-size helmets and large props in a single piece rather than in glued sections.
The A2L stores several calibration sets at different heights up the Z axis to keep the faint vertical banding of tall bed-slinger prints under control.
An add-on blade-cutting and pen module extends the A2L beyond printing for sticker cutting and plotting workflows.
The Neptune 4 Pro ships with Klipper pre-installed — enabling advanced input shaping, pressure advance, and configuration flexibility without modding.
A 500 mm/s rated speed at a price significantly below Bambu and Prusa alternatives.
Full automatic bed leveling reduces setup time and calibration friction.